st_atom_pixeltransfer.c revision 3eb85bf7d941aff1c72e0e0e2d8af18b8b7e496a 
1/**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28/*
29 * Generate fragment programs to implement pixel transfer ops, such as
30 * scale/bias, colormatrix, colortable, convolution...
31 *
32 * Authors:
33 *   Brian Paul
34 */
35
36#include "main/imports.h"
37#include "main/image.h"
38#include "main/macros.h"
39#include "shader/program.h"
40#include "shader/prog_instruction.h"
41#include "shader/prog_parameter.h"
42#include "shader/prog_print.h"
43
44#include "st_context.h"
45#include "st_format.h"
46#include "st_texture.h"
47#include "st_inlines.h"
48
49#include "pipe/p_screen.h"
50#include "pipe/p_context.h"
51#include "util/u_pack_color.h"
52
53
54struct state_key
55{
56   GLuint scaleAndBias:1;
57   GLuint colorMatrix:1;
58   GLuint colorMatrixPostScaleBias:1;
59   GLuint pixelMaps:1;
60
61#if 0
62   GLfloat Maps[3][256][4];
63   int NumMaps;
64   GLint NumStages;
65   pipeline_stage Stages[STAGE_MAX];
66   GLboolean StagesUsed[STAGE_MAX];
67   GLfloat Scale1[4], Bias1[4];
68   GLfloat Scale2[4], Bias2[4];
69#endif
70};
71
72
73static GLboolean
74is_identity(const GLfloat m[16])
75{
76   GLuint i;
77   for (i = 0; i < 16; i++) {
78      const int row = i % 4, col = i / 4;
79      const float val = (GLfloat)(row == col);
80      if (m[i] != val)
81         return GL_FALSE;
82   }
83   return GL_TRUE;
84}
85
86
87static void
88make_state_key(GLcontext *ctx,  struct state_key *key)
89{
90   static const GLfloat zero[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
91   static const GLfloat one[4] = { 1.0f, 1.0f, 1.0f, 1.0f };
92
93   memset(key, 0, sizeof(*key));
94
95   if (ctx->Pixel.RedBias != 0.0 || ctx->Pixel.RedScale != 1.0 ||
96       ctx->Pixel.GreenBias != 0.0 || ctx->Pixel.GreenScale != 1.0 ||
97       ctx->Pixel.BlueBias != 0.0 || ctx->Pixel.BlueScale != 1.0 ||
98       ctx->Pixel.AlphaBias != 0.0 || ctx->Pixel.AlphaScale != 1.0) {
99      key->scaleAndBias = 1;
100   }
101
102   if (!is_identity(ctx->ColorMatrixStack.Top->m)) {
103      key->colorMatrix = 1;
104   }
105
106   if (!TEST_EQ_4V(ctx->Pixel.PostColorMatrixScale, one) ||
107       !TEST_EQ_4V(ctx->Pixel.PostColorMatrixBias, zero)) {
108      key->colorMatrixPostScaleBias = 1;
109   }
110
111   key->pixelMaps = ctx->Pixel.MapColorFlag;
112}
113
114
115static struct pipe_texture *
116create_color_map_texture(GLcontext *ctx)
117{
118   struct pipe_context *pipe = ctx->st->pipe;
119   struct pipe_texture *pt;
120   enum pipe_format format;
121   const uint texSize = 256; /* simple, and usually perfect */
122
123   /* find an RGBA texture format */
124   format = st_choose_format(pipe->screen, GL_RGBA,
125                             PIPE_TEXTURE_2D, PIPE_TEXTURE_USAGE_SAMPLER);
126
127   /* create texture for color map/table */
128   pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, format, 0,
129                          texSize, texSize, 1, PIPE_TEXTURE_USAGE_SAMPLER);
130   return pt;
131}
132
133
134/**
135 * Update the pixelmap texture with the contents of the R/G/B/A pixel maps.
136 */
137static void
138load_color_map_texture(GLcontext *ctx, struct pipe_texture *pt)
139{
140   struct pipe_context *pipe = ctx->st->pipe;
141   struct pipe_screen *screen = pipe->screen;
142   struct pipe_transfer *transfer;
143   const GLuint rSize = ctx->PixelMaps.RtoR.Size;
144   const GLuint gSize = ctx->PixelMaps.GtoG.Size;
145   const GLuint bSize = ctx->PixelMaps.BtoB.Size;
146   const GLuint aSize = ctx->PixelMaps.AtoA.Size;
147   const uint texSize = pt->width[0];
148   uint *dest;
149   uint i, j;
150
151   transfer = st_cond_flush_get_tex_transfer(st_context(ctx),
152					     pt, 0, 0, 0, PIPE_TRANSFER_WRITE,
153					     0, 0, texSize, texSize);
154   dest = (uint *) screen->transfer_map(screen, transfer);
155
156   /* Pack four 1D maps into a 2D texture:
157    * R map is placed horizontally, indexed by S, in channel 0
158    * G map is placed vertically, indexed by T, in channel 1
159    * B map is placed horizontally, indexed by S, in channel 2
160    * A map is placed vertically, indexed by T, in channel 3
161    */
162   for (i = 0; i < texSize; i++) {
163      for (j = 0; j < texSize; j++) {
164         int k = (i * texSize + j);
165         ubyte r = ctx->PixelMaps.RtoR.Map8[j * rSize / texSize];
166         ubyte g = ctx->PixelMaps.GtoG.Map8[i * gSize / texSize];
167         ubyte b = ctx->PixelMaps.BtoB.Map8[j * bSize / texSize];
168         ubyte a = ctx->PixelMaps.AtoA.Map8[i * aSize / texSize];
169         util_pack_color_ub(r, g, b, a, pt->format, dest + k);
170      }
171   }
172
173   screen->transfer_unmap(screen, transfer);
174   screen->tex_transfer_destroy(transfer);
175}
176
177
178
179#define MAX_INST 100
180
181/**
182 * Returns a fragment program which implements the current pixel transfer ops.
183 */
184static struct gl_fragment_program *
185get_pixel_transfer_program(GLcontext *ctx, const struct state_key *key)
186{
187   struct st_context *st = ctx->st;
188   struct prog_instruction inst[MAX_INST];
189   struct gl_program_parameter_list *params;
190   struct gl_fragment_program *fp;
191   GLuint ic = 0;
192   const GLuint colorTemp = 0;
193
194   fp = (struct gl_fragment_program *)
195      ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
196   if (!fp)
197      return NULL;
198
199   params = _mesa_new_parameter_list();
200
201   /*
202    * Get initial pixel color from the texture.
203    * TEX colorTemp, fragment.texcoord[0], texture[0], 2D;
204    */
205   _mesa_init_instructions(inst + ic, 1);
206   inst[ic].Opcode = OPCODE_TEX;
207   inst[ic].DstReg.File = PROGRAM_TEMPORARY;
208   inst[ic].DstReg.Index = colorTemp;
209   inst[ic].SrcReg[0].File = PROGRAM_INPUT;
210   inst[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
211   inst[ic].TexSrcUnit = 0;
212   inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
213   ic++;
214   fp->Base.InputsRead = (1 << FRAG_ATTRIB_TEX0);
215   fp->Base.OutputsWritten = (1 << FRAG_RESULT_COLOR);
216   fp->Base.SamplersUsed = 0x1;  /* sampler 0 (bit 0) is used */
217
218   if (key->scaleAndBias) {
219      static const gl_state_index scale_state[STATE_LENGTH] =
220         { STATE_INTERNAL, STATE_PT_SCALE, 0, 0, 0 };
221      static const gl_state_index bias_state[STATE_LENGTH] =
222         { STATE_INTERNAL, STATE_PT_BIAS, 0, 0, 0 };
223      GLfloat scale[4], bias[4];
224      GLint scale_p, bias_p;
225
226      scale[0] = ctx->Pixel.RedScale;
227      scale[1] = ctx->Pixel.GreenScale;
228      scale[2] = ctx->Pixel.BlueScale;
229      scale[3] = ctx->Pixel.AlphaScale;
230      bias[0] = ctx->Pixel.RedBias;
231      bias[1] = ctx->Pixel.GreenBias;
232      bias[2] = ctx->Pixel.BlueBias;
233      bias[3] = ctx->Pixel.AlphaBias;
234
235      scale_p = _mesa_add_state_reference(params, scale_state);
236      bias_p = _mesa_add_state_reference(params, bias_state);
237
238      /* MAD colorTemp, colorTemp, scale, bias; */
239      _mesa_init_instructions(inst + ic, 1);
240      inst[ic].Opcode = OPCODE_MAD;
241      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
242      inst[ic].DstReg.Index = colorTemp;
243      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
244      inst[ic].SrcReg[0].Index = colorTemp;
245      inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
246      inst[ic].SrcReg[1].Index = scale_p;
247      inst[ic].SrcReg[2].File = PROGRAM_STATE_VAR;
248      inst[ic].SrcReg[2].Index = bias_p;
249      ic++;
250   }
251
252   if (key->pixelMaps) {
253      const GLuint temp = 1;
254
255      /* create the colormap/texture now if not already done */
256      if (!st->pixel_xfer.pixelmap_texture) {
257         st->pixel_xfer.pixelmap_texture = create_color_map_texture(ctx);
258      }
259
260      /* with a little effort, we can do four pixel map look-ups with
261       * two TEX instructions:
262       */
263
264      /* TEX temp.rg, colorTemp.rgba, texture[1], 2D; */
265      _mesa_init_instructions(inst + ic, 1);
266      inst[ic].Opcode = OPCODE_TEX;
267      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
268      inst[ic].DstReg.Index = temp;
269      inst[ic].DstReg.WriteMask = WRITEMASK_XY; /* write R,G */
270      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
271      inst[ic].SrcReg[0].Index = colorTemp;
272      inst[ic].TexSrcUnit = 1;
273      inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
274      ic++;
275
276      /* TEX temp.ba, colorTemp.baba, texture[1], 2D; */
277      _mesa_init_instructions(inst + ic, 1);
278      inst[ic].Opcode = OPCODE_TEX;
279      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
280      inst[ic].DstReg.Index = temp;
281      inst[ic].DstReg.WriteMask = WRITEMASK_ZW; /* write B,A */
282      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
283      inst[ic].SrcReg[0].Index = colorTemp;
284      inst[ic].SrcReg[0].Swizzle = MAKE_SWIZZLE4(SWIZZLE_Z, SWIZZLE_W,
285                                                 SWIZZLE_Z, SWIZZLE_W);
286      inst[ic].TexSrcUnit = 1;
287      inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
288      ic++;
289
290      /* MOV colorTemp, temp; */
291      _mesa_init_instructions(inst + ic, 1);
292      inst[ic].Opcode = OPCODE_MOV;
293      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
294      inst[ic].DstReg.Index = colorTemp;
295      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
296      inst[ic].SrcReg[0].Index = temp;
297      ic++;
298
299      fp->Base.SamplersUsed |= (1 << 1);  /* sampler 1 is used */
300   }
301
302   if (key->colorMatrix) {
303      static const gl_state_index row0_state[STATE_LENGTH] =
304         { STATE_COLOR_MATRIX, 0, 0, 0, 0 };
305      static const gl_state_index row1_state[STATE_LENGTH] =
306         { STATE_COLOR_MATRIX, 0, 1, 1, 0 };
307      static const gl_state_index row2_state[STATE_LENGTH] =
308         { STATE_COLOR_MATRIX, 0, 2, 2, 0 };
309      static const gl_state_index row3_state[STATE_LENGTH] =
310         { STATE_COLOR_MATRIX, 0, 3, 3, 0 };
311
312      GLint row0_p = _mesa_add_state_reference(params, row0_state);
313      GLint row1_p = _mesa_add_state_reference(params, row1_state);
314      GLint row2_p = _mesa_add_state_reference(params, row2_state);
315      GLint row3_p = _mesa_add_state_reference(params, row3_state);
316      const GLuint temp = 1;
317
318      /* DP4 temp.x, colorTemp, matrow0; */
319      _mesa_init_instructions(inst + ic, 1);
320      inst[ic].Opcode = OPCODE_DP4;
321      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
322      inst[ic].DstReg.Index = temp;
323      inst[ic].DstReg.WriteMask = WRITEMASK_X;
324      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
325      inst[ic].SrcReg[0].Index = colorTemp;
326      inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
327      inst[ic].SrcReg[1].Index = row0_p;
328      ic++;
329
330      /* DP4 temp.y, colorTemp, matrow1; */
331      _mesa_init_instructions(inst + ic, 1);
332      inst[ic].Opcode = OPCODE_DP4;
333      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
334      inst[ic].DstReg.Index = temp;
335      inst[ic].DstReg.WriteMask = WRITEMASK_Y;
336      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
337      inst[ic].SrcReg[0].Index = colorTemp;
338      inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
339      inst[ic].SrcReg[1].Index = row1_p;
340      ic++;
341
342      /* DP4 temp.z, colorTemp, matrow2; */
343      _mesa_init_instructions(inst + ic, 1);
344      inst[ic].Opcode = OPCODE_DP4;
345      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
346      inst[ic].DstReg.Index = temp;
347      inst[ic].DstReg.WriteMask = WRITEMASK_Z;
348      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
349      inst[ic].SrcReg[0].Index = colorTemp;
350      inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
351      inst[ic].SrcReg[1].Index = row2_p;
352      ic++;
353
354      /* DP4 temp.w, colorTemp, matrow3; */
355      _mesa_init_instructions(inst + ic, 1);
356      inst[ic].Opcode = OPCODE_DP4;
357      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
358      inst[ic].DstReg.Index = temp;
359      inst[ic].DstReg.WriteMask = WRITEMASK_W;
360      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
361      inst[ic].SrcReg[0].Index = colorTemp;
362      inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
363      inst[ic].SrcReg[1].Index = row3_p;
364      ic++;
365
366      /* MOV colorTemp, temp; */
367      _mesa_init_instructions(inst + ic, 1);
368      inst[ic].Opcode = OPCODE_MOV;
369      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
370      inst[ic].DstReg.Index = colorTemp;
371      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
372      inst[ic].SrcReg[0].Index = temp;
373      ic++;
374   }
375
376   if (key->colorMatrixPostScaleBias) {
377      static const gl_state_index scale_state[STATE_LENGTH] =
378         { STATE_INTERNAL, STATE_PT_SCALE, 0, 0, 0 };
379      static const gl_state_index bias_state[STATE_LENGTH] =
380         { STATE_INTERNAL, STATE_PT_BIAS, 0, 0, 0 };
381      GLint scale_param, bias_param;
382
383      scale_param = _mesa_add_state_reference(params, scale_state);
384      bias_param = _mesa_add_state_reference(params, bias_state);
385
386      _mesa_init_instructions(inst + ic, 1);
387      inst[ic].Opcode = OPCODE_MAD;
388      inst[ic].DstReg.File = PROGRAM_TEMPORARY;
389      inst[ic].DstReg.Index = colorTemp;
390      inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
391      inst[ic].SrcReg[0].Index = colorTemp;
392      inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
393      inst[ic].SrcReg[1].Index = scale_param;
394      inst[ic].SrcReg[2].File = PROGRAM_STATE_VAR;
395      inst[ic].SrcReg[2].Index = bias_param;
396      ic++;
397   }
398
399   /* Modify last instruction's dst reg to write to result.color */
400   {
401      struct prog_instruction *last = &inst[ic - 1];
402      last->DstReg.File = PROGRAM_OUTPUT;
403      last->DstReg.Index = FRAG_RESULT_COLOR;
404   }
405
406   /* END; */
407   _mesa_init_instructions(inst + ic, 1);
408   inst[ic].Opcode = OPCODE_END;
409   ic++;
410
411   assert(ic <= MAX_INST);
412
413
414   fp->Base.Instructions = _mesa_alloc_instructions(ic);
415   if (!fp->Base.Instructions) {
416      _mesa_error(ctx, GL_OUT_OF_MEMORY,
417                  "generating pixel transfer program");
418      return NULL;
419   }
420
421   _mesa_copy_instructions(fp->Base.Instructions, inst, ic);
422   fp->Base.NumInstructions = ic;
423   fp->Base.Parameters = params;
424
425#if 0
426   printf("========= pixel transfer prog\n");
427   _mesa_print_program(&fp->Base);
428   _mesa_print_parameter_list(fp->Base.Parameters);
429#endif
430
431   return fp;
432}
433
434
435
436/**
437 * Update st->pixel_xfer.program in response to new pixel-transfer state.
438 */
439static void
440update_pixel_transfer(struct st_context *st)
441{
442   GLcontext *ctx = st->ctx;
443   struct state_key key;
444   struct gl_fragment_program *fp;
445
446   make_state_key(st->ctx, &key);
447
448   fp = (struct gl_fragment_program *)
449      _mesa_search_program_cache(st->pixel_xfer.cache, &key, sizeof(key));
450   if (!fp) {
451      fp = get_pixel_transfer_program(st->ctx, &key);
452      _mesa_program_cache_insert(st->ctx, st->pixel_xfer.cache,
453                                 &key, sizeof(key), &fp->Base);
454   }
455
456   if (ctx->Pixel.MapColorFlag) {
457      load_color_map_texture(ctx, st->pixel_xfer.pixelmap_texture);
458   }
459   st->pixel_xfer.pixelmap_enabled = ctx->Pixel.MapColorFlag;
460
461   st->pixel_xfer.program = (struct st_fragment_program *) fp;
462}
463
464
465
466const struct st_tracked_state st_update_pixel_transfer = {
467   "st_update_pixel_transfer",				/* name */
468   {							/* dirty */
469      _NEW_PIXEL | _NEW_COLOR_MATRIX,			/* mesa */
470      0,						/* st */
471   },
472   update_pixel_transfer				/* update */
473};
474